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The phrase 'that must have' is correct and usable in written English.
It is used for indicating responsibility and to express that an event has likely happened in the past based on present facts. For example: I noticed that the window was open - that must have been why the house was so cold.
Exact(59)
(A rugby ground? That must have hurt).
Rags that must have been clothes".
What a night that must have been.
Some nursery that must have been.
Over Christmas, that must have sucked.
Man, that must have been amazing.
That must have hurt.
That must have been interesting.
"That must have produced panic.
That must have a cause.
That must have been it.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com